Some of my favorite movies are horror movies, but I have avoided the Hostel movies because it seems more like torture porn than horror.
The most disturbing horror movie that I can remember offhand was Deadgirl. The overall style of the movie was like a good Sundance-type indie film, but the subject matter was an appalling cross between American Pie and Shaun of the Dead, without much humor. And to the extent that there was humor, it was dark, extremely dark.
One other very disturbing horror movie I saw was Dead Ringers, starring Jeremy Irons and directed by David Cronenberg. It was about twin brothers with disturbing obsessions who became gynecologists. It was loosely based on a true story.
Good decisions come from experience. Experience comes from bad decisions.